The "lost city of gold" often refers to the mythical city of El Dorado, which was believed to be filled with immense wealth and treasures. This legend originated from the Spanish conquistadors in the 16th century, who heard tales of a tribal chief covered in gold dust, leading them to search for this fabled city in the South American jungles. Despite numerous expeditions, no evidence of such a city has ever been found. The legend of El Dorado has inspired countless explorers and adventurers, contributing to the allure of treasure hunting and the mysteries of ancient civilizations in the region.